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Definition of senior : 1. A person who is older than another; one more advanced in life.
2. An aged person; an older.
3. Belonging to the final year of the regular course in American colleges, or in professional schools.
4. More advanced than another in age; prior in age; elder; hence, more advanced in dignity, rank, or office; superior; as, senior member; senior counsel.
5. One in the fourth or final year of his collegiate course at an American college; - originally called senior sophister; also, one in the last year of the course at a professional schools or at a seminary.
6. One older in office, or whose entrance upon office was anterior to that of another; one prior in grade.

Synonyms:

old, aged, ripened, of greater dignity, of advanced standing, next older, elderberry bush, next higher in rank, youth, elder, cured, older, new, of age, higher, higher in rank, advanced, over, elderly, fourth-year, sr., more advanced

influential, masterful, important, authoritative, motivational, prejudicial, powerful

crowning, furthest, foremost, master, consummate, champion, king, choice, chief, signal, dominant, controlling, best, maximum, sovereign, superior, elite, leading, A-1, eminent, above, paramount, most, predominant, quintessential, furthermost, ruling, chosen, uppermost, supreme, better, commanding, headmost, zenith, ascendant

veteran, experienced, old soldier, gray-beard, old hand, old-timer, expert, patriarchal, patriarch

guru, mother, dean, commander, manager, governing, landlady, director, kingpin, Lord, sire, officer, proprietress, governor, headmistress, head, quartermaster, executive, squire, proprietor, mandarin, titleholder, commandant, captain, authority, president, mahatma, abbot, star, headmaster, directing, principal, landlord, maestro, leader, ruler, presiding

Usage examples:

• Don't you see there isn't a Senior left?" - "April Hopes", William Dean Howells Last Updated: February 27, 2009.
• Yet, as a matter of fact, Senior had done nothing of the kind. - "The Adventure of Living", John St. Loe Strachey.
• " Hester Gulick and I went to the bridge, and on the way back we overtook a senior named Janet Andrews. - "Betty Wales Freshman", Edith K. Dunton.